Flux Guiding Members for Magnetic Interference in Inductive Charging
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Solution Overview
Problem
Personal care products with rechargeable power sources face challenges in accommodating charging components due to limited internal space, leading to increased size or undesirable component placement, and magnetic fields from docking magnets can interfere with inductive charging efficacy.
Innovation Solution
A personal care product system with a stand and handle featuring permanent docking magnets and inductive charging coils, along with flux guiding members to concentrate magnetic fields, allowing for efficient charging while maintaining a compact form factor and minimizing magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the personal care product is increased to enlarge internal space, then charging components can be accommodated, but the product form factor becomes undesirably large
Solution Approach 1:
The charging coil is positioned within a cavity formed by the flux guiding member, effectively nesting one component inside another. This allows the charging components to be accommodated within the existing product volume without increasing the overall form factor, as the flux guiding member's cavity serves as the housing for the charging coil.
2Reliability
If the distance between docking magnets and inductive charging components is increased to reduce magnetic interference, then charging efficacy is improved, but component placement options are limited and design flexibility is reduced
Solution Approach 1:
The flux guiding member acts as an intermediary structure between the docking magnets and the charging coil. It provides a physical barrier and magnetic flux path that separates the magnetic fields, allowing the components to be positioned close together while minimizing magnetic interference. The cavity-formed flux guiding member serves as a mediating structure that enables both close proximity for compact design and field separation for reduced interference.
3Force
If docking magnets are positioned to provide strong coupling force, then magnetic attraction is improved, but interference with inductive charging system increases
Solution Approach 1:
The flux guiding member creates localized magnetic flux paths that confine the magnetic field primarily to the docking region. By providing a dedicated magnetic circuit through the flux guiding member, the magnetic attraction force is concentrated where needed (at the docking interface) while preventing magnetic field leakage into the charging coil region, thus achieving strong coupling without interference.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables effective inductive charging with improved magnetic field concentration, reducing interference and allowing for proper alignment, thus enhancing charging efficiency and maintaining a small form factor.
Implementation Method 1
a first handle permanent docking magnet positioned within the handle configured to generate an attraction force sufficient to hold the handle to the stand when placed in proximity to the first stand permanent docking magnet
Implementation Method 2
a stand inductive charging coil configured to generate a magnetic field that penetrates the handle inductive charging coil to charge the rechargeable battery
Implementation Method 3
a handle flux guiding member having at least a portion positioned within the handle inductive charging coil and a stand flux guiding member having at least a portion positioned within the stand inductive charging coil
Data Source
AI summary
A personal care product system is provided. The personal care product system has a stand that has a first stand permanent docking magnet. A stand inductive charging coil is also positioned within the stand. A handle that has a first handle permanent docking magnet is removably mounted to the stand. A handle inductive charging coil is positioned within the handle. A handle flux guiding member is in close proximity to a surface of the first handle permanent docking magnet to direct a magnetic field away from the inductive charging coils.